FSet, the functional collections library for Common Lisp.
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README.md

Introduction

FSet is a functional set-theoretic collections library. Functional means that all update operations return a new collection rather than modifying an existing one in place. Set-theoretic means that collections may be nested arbitrarily with no additional programmer effort; for instance, sets may contain sets, maps may be keyed by sets, etc.

The FSet home page explains why I chose functional semantics for FSet.

To get started using FSet, check out the FSet Tutorial. Once you've gone through that, I recommend the FSet/CL page, which explains how FSet is integrated into Common Lisp.

For more details, see the FSet project page.

There might be some useful information on the FSet CLiki page.